Piezoelectric ceramics

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  • This book reviews a big window of opportunity for piezoelectric ceramics, such as new materials, material combinations, structures, damages and porosity effects. In addition, applications of sensors, actuators, transducers for ultrasonic imaging, positioning systems, energy harvesting, biomedical and microelectronic devices are described. The book consists of fourteen chapters. The genetic algorithm is used for identification of RLC parameters in the equivalent electrical circuit of piezoelectric transducers.

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  • Piezoelectricity from the Greek word "piezo" means pressure electricity. Certain crystalline substances generate electric charges under mechanical stress and conversely experience a mechanical strain in the presence of an electric field. The piezoelectric effect was discovered in some naturally occurring materials in the 1880s. However it was not until the Second World War that man-made polycrystalline ceramic ma‐ terials were produced that also showed piezoelectric properties.

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  • This book collects original and innovative research studies concerning modeling and simulation of physical systems in a very wide range of applications, encompassing micro-electro-mechanical systems, measurement instrumentations, catalytic reactors, biomechanical applications, biological and chemical sensors, magnetosensitive materials, silicon photonic devices, electronic devices, optical fibers, electro-microfluidic systems, composite materials, fuel cells, indoor air-conditioning systems, active magnetic levitation systems and more.

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  • Trước tiên chúng ta cần phải hiểu “hiệu ứng áp điện” (piezoelectric effect) nghĩa là gì. Nói ngắn gọn, “hiệu ứng áp điện” là tính chất của một số loại vật chất (thường là ceramic) có khả năng biến đổi tín hiệu điện thành tín hiệu âm và ngược lại có thể biến đổi tín hiệu âm trở lại thành tín hiệu điện (sẽ có một bài viết nói chi tiết về hiệu ứng này sau).

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